A two-dimensional and three-dimensional non-stationary problem of the Collections interaction of a homogeneous impactor and a heterogeneous structure made of steel and ceramics and placed in a Kevlar pocket is considered.The model of the human body is a plate of gelatine with cylindrical inserts-imitators of human bones.The results of numerical simulation using different approaches for describing heterogeneous media are compared.On the basis of direct numerical simulation, it is shown that the gradient armor plate Kettles (steel + B4C) has the best weight and size parameters.